Protective diaphragm ear valve - comprises flexible diaphragm with sound passage aperture between spaced pair of surfaces

摘要

A diaphragm ear valve for protection of the ear drum from the injurious percussive and repercussive overpressure of strong sound waves. The ear valve comprises a flexible diaphragm which has a sound passage aperture through it disposed between a spaced pair of surfaces. The diaphragm is stretched radially outwardly and held by two catcher plate means, each having a sound passage and annular holding means to retain the outer annular diaphragm bead. The apertures afford a sound path of sinuous configuration, and the diaphragm has a thickened portion which co-operates with the surfaces to close off teh sound path when strong sound waves are encountered. The ear valve is adapted to receive an ear canal fitting.